package day1.demo3_arr底层;

import java.util.ArrayList;
import java.util.LinkedList;
import java.util.List;
import java.util.Vector;

public class Test {
    public static void main(String[] args) {
        ArrayList list = new ArrayList(5);
        for (int i = 0; i < 10; i++) {
            list.add("i"+0);
        }
        List list0 = new ArrayList<>();
        Vector v=null;
        v.add("d");
        LinkedList lk=null;
        lk.add("dd");
        lk.get(3);
    }
}
